How to open books with lit, fb2, djvu etc formats?

Is it possible to make donation via PayPal/Alipay/etc ?

Unfortunately, now we accept Amazon gift cards and BTC only.
You can find more information here

I’ve sent a gift card but my account wasn’t upgraded.

Usually it takes 5 minutes to process gift cards, but sometimes it can take longer. Therefore, first check the status of your order on Amazon to make sure that we have received it. If your account is still not upgraded, then check that you have put the correct email recipient (@bookmail.ORG).
If everything is correct, then send a letter from Amazon with the order number to support@bookmail.org